Summary: Use Windows PowerShell to list app background task information.

 How can I use Windows PowerShell to find performance information about app background tasks on my laptop running Windows 8.1?

 Open Windows PowerShell with Admin rights. Use the Get-AppBackgroundTask cmdlet,
          and include the complete name of the app and the –IncludeResourceUsage switch.
          Select the PerfInfo property and expand it.

Get-AppBackgroundTask -PackageFamilyName Microsoft.SkypeApp_kzf8qxf38zg5c -IncludeResourceUsage |
select –expand perfinfo